Tibo's Day 16: Codex now caches API responses 12 hours, permanent cache for logged-in users
Codex engineering lead Thibault Sottiaux announced on Oct 20 that Codex now caches API responses for 12 hours and keeps cache permanently for logged-in users across Codex and Work, with no penalties for revisiting old conversations.
What happened
On Oct 20, 2026, Thibault Sottiaux (OpenAI's Codex engineering lead, @thsottiaux) announced that Codex now caches API responses for 12 hours and keeps cache permanently for logged-in users across Codex and Work, with no penalties for revisiting old conversations. The announcement continues his 28-day Codex pledge of shipping either one clear improvement or a full reset every day, and follows yesterday's Day 15 full limit reset.
Why it matters
Cached API responses mean faster, cheaper repeat work: revisiting an earlier conversation or re-running a similar task no longer costs a full round trip. A permanent user cache makes long-running multi-session projects far less wasteful of quota, which is exactly the friction the 28-day pledge is trying to remove.
Sources: quotatick.com tracked event (announcement time 2026-10-21 01:21 UTC)
Verified 2026-10-20
Sources
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